Manipulate with utc0 time is wrong!

[jetzhliu]

Describe the bug

dayjs('2022-01-23').utcOffset(0, true).format()
// print: 2022-01-23T00:00:00Z

dayjs('2022-01-23').utcOffset(0, true).add(1, 'minute').format()
// print 2022-01-22T16:01:00Z
// !!!

dayjs('2022-01-23').utcOffset(1, true).format()
// print 2022-01-23T00:00:00+01:00

dayjs('2022-01-23').utcOffset(1, true).add(1, 'minute').format()
// print 2022-01-23T00:01:00+01:00

Expected behavior

dayjs('2022-01-23').utcOffset(0, true).add(1, 'minute').format()
// should print:
// print: 2022-01-23T00:01:00Z

Information

• Day.js Version 1.10.7
• OS: MacOs
• Browser chrome 96.0.4664.93
• Time zone: GMT+0800

[jetzhliu]

[jetzhliu]

@iamkun do you have any idea?

[dongyuanxin]

@jetzhliu use utcOffset() after add()

const dayjs = require('dayjs')
const utc = require('dayjs/plugin/utc')

dayjs.extend(utc)

console.log('>>> now is', dayjs('2022-10-24').utcOffset(0, true).format())
console.log('>>> now2 is', dayjs('2022-10-24').add(0, 'm').utcOffset(0, true).format())